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在如何有针对性的产生候选项集，从而减少候选集的规模；在如何提高候选项集的支持事务计数的效率等方面进行了研究，给出了算法的具体实现。
The author also probes into how to get candidate item sets pertinently, reduce the candidates' size and improve the efficiency of candidate item sets supporting item counting and so on.
提出了一种改进的算法，此算法不产生小项候选集而直接产生大项候选集，从而提高了算法的效率。
An improved algorithm, the algorithm does not produce the lesser candidate sets but large items directly from the candidate set to improve the efficiency of the algorithm.
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